We're the Geothermal Source in De Pere! De Pere homeowners in the know look to Action Heating & Cooling Services, LLC for all their geothermal heating and cooling needs. They place their confidence in us to provide not only the proper installation and service but also the insight to help them get the most from their geothermal systems. Thinking about a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a whirl. Just enter your data and marvel at the results. Then, contact us, the De Pere, Wisconsin, geothermal professionals at Action Heating & Cooling Services, LLC.